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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of Long-lived Assets, Advertising Costs and Research and Development Costs (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Accounting Policies [Abstract]      
Asset impairment losses recognized $ 0 $ 0 $ 0
Advertising costs 900,000 900,000 900,000
Research and development expenses paid to third parties $ 100,000 $ 100,000 $ 100,000